The sign of the 1
L
b
Cotton effects (CEs) of the benzene chromophore from about 240 to 270
nm in the
circular dichroism (CD) of enantiomers of ring-substituted chiral
benzylcarbinamines and benzylcarbinamine salts
are correlated with their absolute configurations using the benzene
sector rule and a consideration of the equilibrium
between their two conformers of lowest energy and of oppositely signed
rotatory power. These CEs are the result
of vibronic borrowing from allowed transitions of the benzene
chromophore at shorter wavelength, but an induced
rotatory contribution, the sign of which may be predicted using the
benzene chirality rule, is small compared to the
vibronic contribution and need not be considered when predicting the
sign of the 1
L
b CEs.
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